| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef LOG_TAG |
| #define LOG_TAG "bpfloader" |
| #endif |
| |
| #include <arpa/inet.h> |
| #include <dirent.h> |
| #include <elf.h> |
| #include <error.h> |
| #include <fcntl.h> |
| #include <inttypes.h> |
| #include <linux/bpf.h> |
| #include <linux/unistd.h> |
| #include <net/if.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include <sys/mman.h> |
| #include <sys/socket.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| |
| #include <android-base/properties.h> |
| #include <android-base/stringprintf.h> |
| #include <android-base/strings.h> |
| #include <android-base/unique_fd.h> |
| #include <libbpf_android.h> |
| #include <log/log.h> |
| #include <netdutils/Misc.h> |
| #include <netdutils/Slice.h> |
| #include "bpf/BpfUtils.h" |
| |
| using android::base::EndsWith; |
| using std::string; |
| |
| struct { |
| const char* const dir; |
| const char* const prefix; |
| } locations[] = { |
| // Tethering mainline module |
| { |
| .dir = "/apex/com.android.tethering/etc/bpf/", |
| .prefix = "tethering/", |
| }, |
| // Core operating system |
| { |
| .dir = "/system/etc/bpf/", |
| .prefix = "", |
| }, |
| }; |
| |
| int loadAllElfObjects(const char* const progDir, const char* const prefix) { |
| int retVal = 0; |
| DIR* dir; |
| struct dirent* ent; |
| |
| if ((dir = opendir(progDir)) != NULL) { |
| while ((ent = readdir(dir)) != NULL) { |
| string s = ent->d_name; |
| if (!EndsWith(s, ".o")) continue; |
| |
| string progPath(progDir); |
| progPath += s; |
| |
| bool critical; |
| int ret = android::bpf::loadProg(progPath.c_str(), &critical, prefix); |
| if (ret) { |
| if (critical) retVal = ret; |
| ALOGE("Failed to load object: %s, ret: %s", progPath.c_str(), std::strerror(-ret)); |
| } else { |
| ALOGI("Loaded object: %s", progPath.c_str()); |
| } |
| } |
| closedir(dir); |
| } |
| return retVal; |
| } |
| |
| void createSysFsBpfSubDir(const char* const prefix) { |
| if (*prefix) { |
| mode_t prevUmask = umask(0); |
| |
| string s = "/sys/fs/bpf/"; |
| s += prefix; |
| |
| errno = 0; |
| int ret = mkdir(s.c_str(), S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO); |
| if (ret && errno != EEXIST) { |
| ALOGW("Failed to create directory: %s, ret: %s", s.c_str(), std::strerror(errno)); |
| } |
| |
| umask(prevUmask); |
| } |
| } |
| |
| int main() { |
| // Load all ELF objects, create programs and maps, and pin them |
| for (const auto location : locations) { |
| createSysFsBpfSubDir(location.prefix); |
| if (loadAllElfObjects(location.dir, location.prefix) != 0) { |
| ALOGE("=== CRITICAL FAILURE LOADING BPF PROGRAMS FROM %s ===", location.dir); |
| ALOGE("If this triggers reliably, you're probably missing kernel options or patches."); |
| ALOGE("If this triggers randomly, you might be hitting some memory allocation " |
| "problems or startup script race."); |
| ALOGE("--- DO NOT EXPECT SYSTEM TO BOOT SUCCESSFULLY ---"); |
| sleep(20); |
| return 2; |
| } |
| } |
| |
| if (android::base::SetProperty("bpf.progs_loaded", "1") == false) { |
| ALOGE("Failed to set bpf.progs_loaded property"); |
| return 1; |
| } |
| |
| return 0; |
| } |